Use proper file names in core/fpdfapi/font

This CL splits up font_int.h into files by classes. It also renames the
unittests to match the class being tested. Finally, it renames the ttgsubtable
files to match the class name.

Change-Id: I6187caa9e82d12b9a66e955113fe327d52042ae0
Reviewed-on: https://pdfium-review.googlesource.com/6090
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 379 insertions, 0 deletions

diff --git a/core/fpdfapi/font/cfx_cttgsubtable.cpp b/core/fpdfapi/font/cfx_cttgsubtable.cpp
new file mode 100644
index 0000000000..902957a436
--- /dev/null
+++ b/core/fpdfapi/font/cfx_cttgsubtable.cpp
@@ -0,0 +1,379 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fpdfapi/font/cfx_cttgsubtable.h"
+
+#include <utility>
+
+#include "core/fxge/fx_freetype.h"
+#include "third_party/base/ptr_util.h"
+#include "third_party/base/stl_util.h"
+
+CFX_CTTGSUBTable::CFX_CTTGSUBTable()
+    : m_bFeautureMapLoad(false), loaded(false) {}
+
+CFX_CTTGSUBTable::CFX_CTTGSUBTable(FT_Bytes gsub)
+    : m_bFeautureMapLoad(false), loaded(false) {
+  LoadGSUBTable(gsub);
+}
+
+CFX_CTTGSUBTable::~CFX_CTTGSUBTable() {}
+
+bool CFX_CTTGSUBTable::IsOk() const {
+  return loaded;
+}
+
+bool CFX_CTTGSUBTable::LoadGSUBTable(FT_Bytes gsub) {
+  header.Version = gsub[0] << 24 | gsub[1] << 16 | gsub[2] << 8 | gsub[3];
+  if (header.Version != 0x00010000) {
+    return false;
+  }
+  header.ScriptList = gsub[4] << 8 | gsub[5];
+  header.FeatureList = gsub[6] << 8 | gsub[7];
+  header.LookupList = gsub[8] << 8 | gsub[9];
+  return Parse(&gsub[header.ScriptList], &gsub[header.FeatureList],
+               &gsub[header.LookupList]);
+}
+
+bool CFX_CTTGSUBTable::GetVerticalGlyph(uint32_t glyphnum,
+                                        uint32_t* vglyphnum) {
+  uint32_t tag[] = {
+      (uint8_t)'v' << 24 | (uint8_t)'r' << 16 | (uint8_t)'t' << 8 |
+          (uint8_t)'2',
+      (uint8_t)'v' << 24 | (uint8_t)'e' << 16 | (uint8_t)'r' << 8 |
+          (uint8_t)'t',
+  };
+  if (!m_bFeautureMapLoad) {
+    for (const auto& script : ScriptList.ScriptRecords) {
+      for (const auto& record : script.Script.LangSysRecords) {
+        for (const auto& index : record.LangSys.FeatureIndices) {
+          if (FeatureList.FeatureRecords[index].FeatureTag == tag[0] ||
+              FeatureList.FeatureRecords[index].FeatureTag == tag[1]) {
+            m_featureSet.insert(index);
+          }
+        }
+      }
+    }
+    if (m_featureSet.empty()) {
+      int i = 0;
+      for (const auto& feature : FeatureList.FeatureRecords) {
+        if (feature.FeatureTag == tag[0] || feature.FeatureTag == tag[1])
+          m_featureSet.insert(i);
+        ++i;
+      }
+    }
+    m_bFeautureMapLoad = true;
+  }
+  for (const auto& item : m_featureSet) {
+    if (GetVerticalGlyphSub(glyphnum, vglyphnum,
+                            &FeatureList.FeatureRecords[item].Feature)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool CFX_CTTGSUBTable::GetVerticalGlyphSub(uint32_t glyphnum,
+                                           uint32_t* vglyphnum,
+                                           TFeature* Feature) {
+  for (int index : Feature->LookupListIndices) {
+    if (!pdfium::IndexInBounds(LookupList.Lookups, index))
+      continue;
+    if (LookupList.Lookups[index].LookupType == 1 &&
+        GetVerticalGlyphSub2(glyphnum, vglyphnum, &LookupList.Lookups[index])) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool CFX_CTTGSUBTable::GetVerticalGlyphSub2(uint32_t glyphnum,
+                                            uint32_t* vglyphnum,
+                                            TLookup* Lookup) {
+  for (const auto& subTable : Lookup->SubTables) {
+    switch (subTable->SubstFormat) {
+      case 1: {
+        auto* tbl1 = static_cast<TSingleSubstFormat1*>(subTable.get());
+        if (GetCoverageIndex(tbl1->Coverage.get(), glyphnum) >= 0) {
+          *vglyphnum = glyphnum + tbl1->DeltaGlyphID;
+          return true;
+        }
+        break;
+      }
+      case 2: {
+        auto* tbl2 = static_cast<TSingleSubstFormat2*>(subTable.get());
+        int index = GetCoverageIndex(tbl2->Coverage.get(), glyphnum);
+        if (pdfium::IndexInBounds(tbl2->Substitutes, index)) {
+          *vglyphnum = tbl2->Substitutes[index];
+          return true;
+        }
+        break;
+      }
+    }
+  }
+  return false;
+}
+
+int CFX_CTTGSUBTable::GetCoverageIndex(TCoverageFormatBase* Coverage,
+                                       uint32_t g) const {
+  if (!Coverage)
+    return -1;
+
+  switch (Coverage->CoverageFormat) {
+    case 1: {
+      int i = 0;
+      TCoverageFormat1* c1 = (TCoverageFormat1*)Coverage;
+      for (const auto& glyph : c1->GlyphArray) {
+        if (static_cast<uint32_t>(glyph) == g)
+          return i;
+        ++i;
+      }
+      return -1;
+    }
+    case 2: {
+      TCoverageFormat2* c2 = (TCoverageFormat2*)Coverage;
+      for (const auto& rangeRec : c2->RangeRecords) {
+        uint32_t s = rangeRec.Start;
+        uint32_t e = rangeRec.End;
+        uint32_t si = rangeRec.StartCoverageIndex;
+        if (s <= g && g <= e)
+          return si + g - s;
+      }
+      return -1;
+    }
+  }
+  return -1;
+}
+
+uint8_t CFX_CTTGSUBTable::GetUInt8(FT_Bytes& p) const {
+  uint8_t ret = p[0];
+  p += 1;
+  return ret;
+}
+
+int16_t CFX_CTTGSUBTable::GetInt16(FT_Bytes& p) const {
+  uint16_t ret = p[0] << 8 | p[1];
+  p += 2;
+  return *(int16_t*)&ret;
+}
+
+uint16_t CFX_CTTGSUBTable::GetUInt16(FT_Bytes& p) const {
+  uint16_t ret = p[0] << 8 | p[1];
+  p += 2;
+  return ret;
+}
+
+int32_t CFX_CTTGSUBTable::GetInt32(FT_Bytes& p) const {
+  uint32_t ret = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+  p += 4;
+  return *(int32_t*)&ret;
+}
+
+uint32_t CFX_CTTGSUBTable::GetUInt32(FT_Bytes& p) const {
+  uint32_t ret = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+  p += 4;
+  return ret;
+}
+
+bool CFX_CTTGSUBTable::Parse(FT_Bytes scriptlist,
+                             FT_Bytes featurelist,
+                             FT_Bytes lookuplist) {
+  ParseScriptList(scriptlist, &ScriptList);
+  ParseFeatureList(featurelist, &FeatureList);
+  ParseLookupList(lookuplist, &LookupList);
+  return true;
+}
+
+void CFX_CTTGSUBTable::ParseScriptList(FT_Bytes raw, TScriptList* rec) {
+  FT_Bytes sp = raw;
+  rec->ScriptRecords = std::vector<TScriptRecord>(GetUInt16(sp));
+  for (auto& scriptRec : rec->ScriptRecords) {
+    scriptRec.ScriptTag = GetUInt32(sp);
+    ParseScript(&raw[GetUInt16(sp)], &scriptRec.Script);
+  }
+}
+
+void CFX_CTTGSUBTable::ParseScript(FT_Bytes raw, TScript* rec) {
+  FT_Bytes sp = raw;
+  rec->DefaultLangSys = GetUInt16(sp);
+  rec->LangSysRecords = std::vector<TLangSysRecord>(GetUInt16(sp));
+  for (auto& sysRecord : rec->LangSysRecords) {
+    sysRecord.LangSysTag = GetUInt32(sp);
+    ParseLangSys(&raw[GetUInt16(sp)], &sysRecord.LangSys);
+  }
+}
+
+void CFX_CTTGSUBTable::ParseLangSys(FT_Bytes raw, TLangSys* rec) {
+  FT_Bytes sp = raw;
+  rec->LookupOrder = GetUInt16(sp);
+  rec->ReqFeatureIndex = GetUInt16(sp);
+  rec->FeatureIndices = std::vector<uint16_t>(GetUInt16(sp));
+  for (auto& element : rec->FeatureIndices)
+    element = GetUInt16(sp);
+}
+
+void CFX_CTTGSUBTable::ParseFeatureList(FT_Bytes raw, TFeatureList* rec) {
+  FT_Bytes sp = raw;
+  rec->FeatureRecords = std::vector<TFeatureRecord>(GetUInt16(sp));
+  for (auto& featureRec : rec->FeatureRecords) {
+    featureRec.FeatureTag = GetUInt32(sp);
+    ParseFeature(&raw[GetUInt16(sp)], &featureRec.Feature);
+  }
+}
+
+void CFX_CTTGSUBTable::ParseFeature(FT_Bytes raw, TFeature* rec) {
+  FT_Bytes sp = raw;
+  rec->FeatureParams = GetUInt16(sp);
+  rec->LookupListIndices = std::vector<uint16_t>(GetUInt16(sp));
+  for (auto& listIndex : rec->LookupListIndices)
+    listIndex = GetUInt16(sp);
+}
+
+void CFX_CTTGSUBTable::ParseLookupList(FT_Bytes raw, TLookupList* rec) {
+  FT_Bytes sp = raw;
+  rec->Lookups = std::vector<TLookup>(GetUInt16(sp));
+  for (auto& lookup : rec->Lookups)
+    ParseLookup(&raw[GetUInt16(sp)], &lookup);
+}
+
+void CFX_CTTGSUBTable::ParseLookup(FT_Bytes raw, TLookup* rec) {
+  FT_Bytes sp = raw;
+  rec->LookupType = GetUInt16(sp);
+  rec->LookupFlag = GetUInt16(sp);
+  rec->SubTables = std::vector<std::unique_ptr<TSubTableBase>>(GetUInt16(sp));
+  if (rec->LookupType != 1)
+    return;
+
+  for (auto& subTable : rec->SubTables)
+    ParseSingleSubst(&raw[GetUInt16(sp)], &subTable);
+}
+
+std::unique_ptr<CFX_CTTGSUBTable::TCoverageFormatBase>
+CFX_CTTGSUBTable::ParseCoverage(FT_Bytes raw) {
+  FT_Bytes sp = raw;
+  uint16_t format = GetUInt16(sp);
+  if (format == 1) {
+    auto rec = pdfium::MakeUnique<TCoverageFormat1>();
+    ParseCoverageFormat1(raw, rec.get());
+    return std::move(rec);
+  }
+  if (format == 2) {
+    auto rec = pdfium::MakeUnique<TCoverageFormat2>();
+    ParseCoverageFormat2(raw, rec.get());
+    return std::move(rec);
+  }
+  return nullptr;
+}
+
+void CFX_CTTGSUBTable::ParseCoverageFormat1(FT_Bytes raw,
+                                            TCoverageFormat1* rec) {
+  FT_Bytes sp = raw;
+  (void)GetUInt16(sp);
+  rec->GlyphArray = std::vector<uint16_t>(GetUInt16(sp));
+  for (auto& glyph : rec->GlyphArray)
+    glyph = GetUInt16(sp);
+}
+
+void CFX_CTTGSUBTable::ParseCoverageFormat2(FT_Bytes raw,
+                                            TCoverageFormat2* rec) {
+  FT_Bytes sp = raw;
+  (void)GetUInt16(sp);
+  rec->RangeRecords = std::vector<TRangeRecord>(GetUInt16(sp));
+  for (auto& rangeRec : rec->RangeRecords) {
+    rangeRec.Start = GetUInt16(sp);
+    rangeRec.End = GetUInt16(sp);
+    rangeRec.StartCoverageIndex = GetUInt16(sp);
+  }
+}
+
+void CFX_CTTGSUBTable::ParseSingleSubst(FT_Bytes raw,
+                                        std::unique_ptr<TSubTableBase>* rec) {
+  FT_Bytes sp = raw;
+  uint16_t Format = GetUInt16(sp);
+  switch (Format) {
+    case 1:
+      *rec = pdfium::MakeUnique<TSingleSubstFormat1>();
+      ParseSingleSubstFormat1(raw,
+                              static_cast<TSingleSubstFormat1*>(rec->get()));
+      break;
+    case 2:
+      *rec = pdfium::MakeUnique<TSingleSubstFormat2>();
+      ParseSingleSubstFormat2(raw,
+                              static_cast<TSingleSubstFormat2*>(rec->get()));
+      break;
+  }
+}
+
+void CFX_CTTGSUBTable::ParseSingleSubstFormat1(FT_Bytes raw,
+                                               TSingleSubstFormat1* rec) {
+  FT_Bytes sp = raw;
+  GetUInt16(sp);
+  uint16_t offset = GetUInt16(sp);
+  rec->Coverage = ParseCoverage(&raw[offset]);
+  rec->DeltaGlyphID = GetInt16(sp);
+}
+
+void CFX_CTTGSUBTable::ParseSingleSubstFormat2(FT_Bytes raw,
+                                               TSingleSubstFormat2* rec) {
+  FT_Bytes sp = raw;
+  (void)GetUInt16(sp);
+  uint16_t offset = GetUInt16(sp);
+  rec->Coverage = ParseCoverage(&raw[offset]);
+  rec->Substitutes = std::vector<uint16_t>(GetUInt16(sp));
+  for (auto& substitute : rec->Substitutes)
+    substitute = GetUInt16(sp);
+}
+
+CFX_CTTGSUBTable::TCoverageFormat1::TCoverageFormat1()
+    : TCoverageFormatBase(1) {}
+
+CFX_CTTGSUBTable::TCoverageFormat1::~TCoverageFormat1() {}
+
+CFX_CTTGSUBTable::TRangeRecord::TRangeRecord()
+    : Start(0), End(0), StartCoverageIndex(0) {}
+
+CFX_CTTGSUBTable::TCoverageFormat2::TCoverageFormat2()
+    : TCoverageFormatBase(2) {}
+
+CFX_CTTGSUBTable::TCoverageFormat2::~TCoverageFormat2() {}
+
+CFX_CTTGSUBTable::TSingleSubstFormat1::TSingleSubstFormat1()
+    : TSubTableBase(1), DeltaGlyphID(0) {}
+
+CFX_CTTGSUBTable::TSingleSubstFormat1::~TSingleSubstFormat1() {}
+
+CFX_CTTGSUBTable::TSingleSubstFormat2::TSingleSubstFormat2()
+    : TSubTableBase(2) {}
+
+CFX_CTTGSUBTable::TSingleSubstFormat2::~TSingleSubstFormat2() {}
+
+CFX_CTTGSUBTable::TLookup::TLookup() : LookupType(0), LookupFlag(0) {}
+
+CFX_CTTGSUBTable::TLookup::~TLookup() {}
+
+CFX_CTTGSUBTable::TScript::TScript() : DefaultLangSys(0) {}
+
+CFX_CTTGSUBTable::TScript::~TScript() {}
+
+CFX_CTTGSUBTable::TScriptList::TScriptList() {}
+
+CFX_CTTGSUBTable::TScriptList::~TScriptList() {}
+
+CFX_CTTGSUBTable::TFeature::TFeature() : FeatureParams(0) {}
+
+CFX_CTTGSUBTable::TFeature::~TFeature() {}
+
+CFX_CTTGSUBTable::TFeatureList::TFeatureList() {}
+
+CFX_CTTGSUBTable::TFeatureList::~TFeatureList() {}
+
+CFX_CTTGSUBTable::TLookupList::TLookupList() {}
+
+CFX_CTTGSUBTable::TLookupList::~TLookupList() {}
+
+CFX_CTTGSUBTable::TLangSys::TLangSys() : LookupOrder(0), ReqFeatureIndex(0) {}
+
+CFX_CTTGSUBTable::TLangSys::~TLangSys() {}